After preventing creating an import library for an exe when there are no exports...

After preventing creating an import library for an exe when there are no exports, to avoid a crash, it turned out that some projects expected to be able to create an import library for a dll with no exports, so more closely match the condition to the condition around initializing the dll name.

	PR 26588
	* emultempl/pe.em (_finish): Generate an import library for DLLs,
	even if they have no exports.
	* emultempl/pep.em (_finish): Likewise.